Coal chemical projects represent a significant application area for steel structure engineering. From equipment frames to process pipe racks, coal conveyor galleries, and coal bunkers, steel structures provide critical support functions. According to the China Steel Structure Association, annual steel consumption in this sector exceeds 5 million tons, making it one of the largest industrial sub-markets for steel construction.
This article systematically analyzes the core content of coal chemical steel structure engineering from three dimensions: structural types, design essentials, and key construction technologies.
1.Main Structural Types in Coal Chemical Projects
The steel structure system in coal chemical projects can be categorized into six main functional types:
| Structure Type | Function & Characteristics | Key Metrics |
| Equipment Frames | Core load-bearing structures for reactors, towers, and heat exchangers. | 35–45% of total steel usage; 3–8 layers; 150–300 kg/m² unit weight. |
| Process Pipe Racks | Channels connecting different units, supporting pipelines. | 20–25% of total steel usage; 2–4 layers; Loads often pre-designed. |
| Coal Conveyor Galleries | Passage for transporting raw coal from storage to gasifiers. | 10–15% of total steel usage; Truss structure; 30–60m spans. |
| Coal Bunkers & Silos | Storage structures requiring thick plate welding. | Plate thickness typically 16–40 mm. |
| Flare Stacks | Tall structures for burning off waste gas. | Height up to 80–150 m. |
| Specialized Platforms | Platforms for desulfurization and denitrification units. | Customized based on process requirements. |
2.Design Keys: Corrosion & Fire Protection are Paramount
Given the harsh environments involving high temperatures, pressure, and flammable media, the core design focus is on durability and safety.
Corrosion Protection
Environment: Typically classified as C4 to C5 corrosive environments.
Surface Prep: Must reach Sa2.5 cleanliness standard.
Coating: Total dry film thickness ≥280 µm. Critical nodes require an additional 50–80 µm.
Lifespan: For structures contacting corrosive media, thermal spray aluminum (TSA) is used, targeting a 15-year+ lifespan.
Fire Protection
Rating: Steel members in process areas require a fire resistance rating of 1.5 to 3 hours.
Material: Thick-film intumescent or cementitious coatings are widely used.
Thickness: For a 3-hour rating, coating thickness ranges from 25 to 40 mm.
Note:The new standard T/CECS 200-2025 introduces more granular requirements.
Structural Design
Beyond standard loads (dead, live, wind), designs must account for pipe thermal thrust and equipment vibration. Component stress ratios are typically controlled within 0.85 to allow for future process modifications.
3.Key Construction Technologies
Detailed Design (Tekla/BIM)
Using platforms like Tekla Structures for 3D modeling allows for automatic generation of shop drawings and clash detection with piping/electrical systems. Industry experience shows that thorough detailed design can reduce on-site modifications by approximately 70%.
Component Processing
Heavy plate welding is prevalent. Welding Procedure Specification (WPS) must cover all joint types and thicknesses. Welders must be certified, and 100% Ultrasonic Testing (UT) is required for critical joints.
On-site Installation
Installation sequences must coordinate with equipment delivery schedules. The industry best practice involves 4D BIM simulation to virtually verify lifting schemes before field execution.
4.Capability Requirements for Steel Structure Enterprises
The technical threshold for coal chemical projects is significantly higher than for ordinary industrial buildings. With cumulative investment exceeding 650 billion CNY in regions like Inner Mongolia and Xinjiang, enterprises need four core capabilities:
Massive Capacity: Single projects require 20,000–50,000 tons of steel, demanding peak monthly deliveries of 3,000–5,000 tons.
Full Lifecycle Service: Integrated capability covering design, fabrication, coating, and installation.
Extreme Environment Adaptability: Experience in high-altitude, cold regions (temperatures down to -20°C to -30°C).
Traceability Systems: Ability to track raw material batch numbers, welding parameters, and coating thickness for every component.
Conclusion
The coal chemical industry is a vital growth engine for steel structure engineering. It tests an enterprise’s comprehensive capabilities—from diverse structural types and stringent anti-corrosion/fireproofing designs to complex construction management. For companies with large-project experience and integrated delivery capabilities, this sector offers substantial market opportunities.